Seiko Cal. 4540 - 638

The 4540-638 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 4540 caliber with 21j jewels beating at 36,000 bph, it delivers a 56 hours power reserve. [seikata-wm-12fd111cbecd]

Also known as: UFO, Golden Tuna

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

46mm

Case Thickness

9.6mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

180m

Dial Color

Silver

Jewels

21j

Frequency

36,000 bph

Power Reserve

56 hours

Year

1988

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